Discontinuous Electromagnetic Fields Using Huygens Sources For Wavefront Manipulation

TL;DR

This paper presents a novel method for wavefront manipulation using discontinuous electromagnetic fields created by Huygens sources, enabling advanced beam shaping, cloaking, and refraction techniques.

Contribution

It introduces a new approach to design electromagnetic discontinuities with electric and magnetic currents for wavefront control, including passive and active implementations.

Findings

Demonstrates cloaking schemes using dipole arrays.

Shows arbitrary beam refraction with impedance/admittance surfaces.

Establishes a generalized refraction method via discontinuous fields.

Abstract

We introduce the idea of discontinuous electric and magnetic fields at a boundary to design and shape wavefronts in an arbitrary manner. To create this discontinuity in the field we use electric and magnetic currents which act like a Huygens source to radiate the desired wavefront. These currents can be synthesized either by an array of electric and magnetic dipoles or by a combined impedance and admittance surface. A dipole array is an active implementation to impose discontinuous fields while the impedance/admittance surface acts as a passive one. We then expand on our previous work showing how electric and magnetic dipole arrays can be used to cloak an object demonstrating two novel cloaking schemes. We also show how to arbitrarily refract a beam using a set of impedance and admittance surfaces. Refraction using the idea of discontinuous fields is shown to be a more general case of refraction using phase discontinuities.